I find Firefox for Android has the best features (with extensions), but it can be quite slow and jerky to scroll and render pages compared to other browsers such as Chrome. Is there anything that can be done to improve the performance of Firefox on mobile devices (phones and tablets)?

Chances are you won't be using as many addons as you are on desktop, so you should be able to use the latest development changes as they are added.

I do feel that Nightly is a fair bit faster.

Interesting idea but for normal use I prefer to use a stable release build. I find Brave Browser to have the best performance (and good features) on Android. However, Firefox has more features overall. It would be nice if Firefox could get the speed that Brave has.